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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a14a6a52b34fbdc59c333cd41493cd3797e9c912e57821fbd8e62825aa7d467' 
  AND token = 'i1ZW0vUxXiyZiRT2HJvtfk8h3vwBMbi+SkX49x43ASY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}